JavaScript Symbol Reference

In JavaScript, the Symbol is a primitive data type introduced in ES6. It is created using the `Symbol()` function, which returns a unique symbol value each time it is called. Symbols are immutable and unique, making them useful for creating property keys that are guaranteed to be unique across different objects. They are often used to define non-enumerable object properties.

Syntax:

[Symbol.property](string)

Example: JavaScript code to show the working of this function. 

// Creating some arrays
const Array1 = [1, 2, 3];
const Array2 = [4, 5, 6];

// Calling concat() function
let Array3 = Array1.concat(Array2);

// Printing the concatenated array
console.log(Array3);

// Calling Symbol.isConcatSpreadable symbol
Array2[Symbol.isConcatSpreadable] = false;
Array3 = Array1.concat(Array2);

// Printing the concatenated array
// after calling of Symbol.isConcatSpreadable symbol
console.log(Array3);

[ 1, 2, 3, 4, 5, 6 ]
[ 1, 2, 3, [ 4, 5, 6, [Symbol(Symbol.isConcatSpreadable)]: false ] ]

The complete list of JavaScript Symbol is listed below:

JavaScript Symbol Constructor: In JavaScript, a constructor gets called when an object is created.

JavaScript Symbol Properties: A JavaScript property is a member of an object that associates a key with a value.

• Static Property: A static property is a property that has the same value for the entire class.

• Instance Properties: An instance property is a property that has a new copy for every new instance of the class.

JavaScript Symbol Methods: JavaScript methods are actions that can be performed on objects. There are two types of Symbol methods in JavaScript.

• Static Method: If the method is called using the symbol class itself then it is called a static method.

• Instance Method: If the method is called on an instance of a Symbol then it is called an instance method.

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Article Tags :

• JavaScript
• Web Technologies
• JavaScript-Symbol